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		<time class="dt-published" datetime="2019-11-01T00:00:00-04:00" itemprop="datePublished">Friday, November 1, 2019
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		<h1 id="0084-notebook-viii--child-widgets">0084: Notebook VIII – Child Widgets</h1>

<p>Accessing any child widgets we’ve stuffed into <code class="language-plaintext highlighter-rouge">Notebook</code> pages—for loading or saving a document, for instance… or changing/updating the tab label—takes a bit of prep that you might not expect, but by relying on the <code class="language-plaintext highlighter-rouge">Notebook</code>’s in-built tab managing system, it’s relatively straightforward.</p>

<h2 id="accessing-the-widget-in-the-page">Accessing the Widget in the Page</h2>

<!-- 0, 1 -->
<!-- first occurrence of application and terminal screen shots on a single page -->
<div class="screenshot-frame">
	<div class="frame-header">
		Results of this example:
	</div>
	<div class="frame-screenshot">
		<figure>
			<img id="img0" src="../images/screenshots/014_container/container_19.png" alt="Current example output" />		<!-- img# -->
			
			<!-- Modal for screenshot -->
			<div id="modal0" class="modal">																	<!-- modal# -->
				<span class="close0">&times;</span>															<!-- close# -->
				<img class="modal-content" id="img00" />															<!-- img## -->
				<div id="caption"></div>
			</div>
			
			<script>
			// Get the modal
			var modal = document.getElementById("modal0");														// modal#
			
			// Get the image and insert it inside the modal - use its "alt" text as a caption
			var img = document.getElementById("img0");															// img#
			var modalImg = document.getElementById("img00");													// img##
			var captionText = document.getElementById("caption");

			img.onclick = function()
			{
			  modal.style.display = "block";
			  modalImg.src = this.src;
			  captionText.innerHTML = this.alt;
			}
			
			// Get the <span> element that closes the modal
			var span = document.getElementsByClassName("close0")[0];											// close#
			
			// When the user clicks on <span> (x), close the modal
			span.onclick = function()
			{ 
				modal.style.display = "none";
			}
			</script>
			<figcaption>
			Current example output
			</figcaption>
		</figure>
	</div>

	<div class="frame-terminal">
		<figure class="right">
			<img id="img1" src="../images/screenshots/014_container/container_19_term.png" alt="Current example terminal output" />		<!-- img#, filename -->

			<!-- Modal for terminal shot -->
			<div id="modal1" class="modal">																				<!-- modal# -->
				<span class="close1">&times;</span>																		<!-- close# -->
				<img class="modal-content" id="img11" />																		<!-- img## -->
				<div id="caption"></div>
			</div>
			
			<script>
			// Get the modal
			var modal = document.getElementById("modal1");																	// modal#
			
			// Get the image and insert it inside the modal - use its "alt" text as a caption
			var img = document.getElementById("img1");																		// img#
			var modalImg = document.getElementById("img11");																// img##
			var captionText = document.getElementById("caption");

			img.onclick = function()
			{
			  modal.style.display = "block";
			  modalImg.src = this.src;
			  captionText.innerHTML = this.alt;
			}
			
			// Get the <span> element that closes the modal
			var span = document.getElementsByClassName("close1")[0];														// close#
			
			// When the user clicks on <span> (x), close the modal
			span.onclick = function()
			{ 
				modal.style.display = "none";
			}
			</script>

			<figcaption>
				Current example terminal output (click for enlarged view)
			</figcaption>
		</figure>
	</div>

	<div class="frame-footer">																								<!-- ------------- filename (below) --------- -->
		The code file for this example is available <a href="https://github.com/rontarrant/gtkd_demos/blob/master/014_container/container_19_notebook_child_widgets.d" target="_blank">here</a>.
	</div>
</div>
<!-- end of snippet for first (1st) occurrence of application and terminal screen shots on a single page -->

<p>Setting the text in a <code class="language-plaintext highlighter-rouge">TextView</code> is something we’ve seen before in <a href="https://github.com/rontarrant/gtkd_demos/blob/master/014_container/container_10_notebook_basic.d">the first Notebook demo</a> and—cherry picking statements from the preamble and constructor—goes something like this:</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="n">TextBuffer</span> <span class="n">textBuffer</span><span class="p">;</span>
<span class="nb">string</span> <span class="n">content</span> <span class="p">=</span> <span class="s">"Now is the English of our discontent."</span><span class="p">;</span>

<span class="n">textBuffer</span> <span class="p">=</span> <span class="n">getBuffer</span><span class="p">();</span>
<span class="n">textBuffer</span><span class="p">.</span><span class="n">setText</span><span class="p">(</span><span class="n">content</span><span class="p">);</span>
</code></pre></div></div>

<p>Once everything’s prepped, a call to <code class="language-plaintext highlighter-rouge">setText()</code> does it. But what about the other way around, accessing the content of a specific <code class="language-plaintext highlighter-rouge">Notebook</code> page for the purposes of saving it?</p>

<h2 id="retrieval-of-page-content">Retrieval of Page Content</h2>

<p>No matter what type of <code class="language-plaintext highlighter-rouge">Widget</code> we stuffed into our <code class="language-plaintext highlighter-rouge">Notebook</code> page, the process is the same:</p>

<ul>
  <li>ask the <code class="language-plaintext highlighter-rouge">Notebook</code> for the current page with a call to <code class="language-plaintext highlighter-rouge">getCurrentPage()</code>, and</li>
  <li>get a pointer to that page’s child <code class="language-plaintext highlighter-rouge">Widget</code> using <code class="language-plaintext highlighter-rouge">getNthPage()</code>.</li>
</ul>

<p>Note that we have to cast the result of <code class="language-plaintext highlighter-rouge">getNthPage()</code> because <code class="language-plaintext highlighter-rouge">Notebook</code> doesn’t keep track of which type of <code class="language-plaintext highlighter-rouge">Widget</code> we stuffed in there. So if we used something more elaborate than a single <code class="language-plaintext highlighter-rouge">TextView</code> widget… say a <code class="language-plaintext highlighter-rouge">Grid</code> with five <code class="language-plaintext highlighter-rouge">Entry</code>s… and we wanted to access them, we’d have to get a pointer to the <code class="language-plaintext highlighter-rouge">Grid</code> and then access the <code class="language-plaintext highlighter-rouge">Entry</code>s using the <code class="language-plaintext highlighter-rouge">Grid</code>’s <code class="language-plaintext highlighter-rouge">getChildren()</code> function.</p>

<p>But in our current example, once we’ve got a pointer to the <code class="language-plaintext highlighter-rouge">TextView</code>, we get the text by:</p>

<ul>
  <li>grabbing a pointer to the <code class="language-plaintext highlighter-rouge">TextBuffer</code> with <code class="language-plaintext highlighter-rouge">TextView.getBuffer()</code>, and</li>
  <li>yanking out the text with <code class="language-plaintext highlighter-rouge">TextBuffer.getText()</code>.</li>
</ul>

<p>And once you’ve got that, saving the text is a matter of passing it along to an appropriate function.</p>

<h3 id="the-pageinfobutton">The PageInfoButton</h3>

<p>But for this demo, we won’t go into saving. Instead, we’ll just prove to ourselves that we’ve got access to everything by adding another <code class="language-plaintext highlighter-rouge">Button</code> to our interface and hooking up a callback that echoes all pertinent information to the command prompt window. The <code class="language-plaintext highlighter-rouge">PageInfoButton</code> class, complete with callback, looks like this:</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="k">class</span> <span class="n">PageInfoButton</span> <span class="p">:</span> <span class="n">Button</span>
<span class="p">{</span>
	<span class="nb">string</span> <span class="n">_buttonLabel</span> <span class="p">=</span> <span class="s">"Page Info"</span><span class="p">;</span>

	<span class="n">MyNotebook</span> <span class="n">_myNotebook</span><span class="p">;</span>

	<span class="k">this</span><span class="p">(</span><span class="n">MyNotebook</span> <span class="n">myNotebook</span><span class="p">)</span>
	<span class="p">{</span>
		<span class="k">super</span><span class="p">(</span><span class="n">_buttonLabel</span><span class="p">);</span>
		<span class="n">_myNotebook</span> <span class="p">=</span> <span class="n">myNotebook</span><span class="p">;</span>
		
		<span class="n">addOnClicked</span><span class="p">(&amp;</span><span class="n">onClicked</span><span class="p">);</span>
				
	<span class="p">}</span> <span class="c1">// this()</span>
	
	
	<span class="kt">void</span> <span class="n">onClicked</span><span class="p">(</span><span class="n">Button</span> <span class="n">button</span><span class="p">)</span>
	<span class="p">{</span>
		<span class="kt">int</span> <span class="n">currentPage</span> <span class="p">=</span> <span class="n">_myNotebook</span><span class="p">.</span><span class="n">getCurrentPage</span><span class="p">();</span>
		<span class="n">TabTextView</span> <span class="n">tabTextView</span> <span class="p">=</span> <span class="k">cast</span><span class="p">(</span><span class="n">TabTextView</span><span class="p">)</span><span class="n">_myNotebook</span><span class="p">.</span><span class="n">getNthPage</span><span class="p">(</span><span class="n">currentPage</span><span class="p">);</span>
		<span class="n">Label</span> <span class="n">tabLabel</span> <span class="p">=</span> <span class="k">cast</span><span class="p">(</span><span class="n">Label</span><span class="p">)</span><span class="n">_myNotebook</span><span class="p">.</span><span class="n">getTabLabel</span><span class="p">(</span><span class="n">tabTextView</span><span class="p">);</span>
		
		<span class="n">writeln</span><span class="p">(</span><span class="s">"currentPage position in the Notebook tabs array:"</span><span class="p">,</span> <span class="n">currentPage</span><span class="p">);</span>
		<span class="n">writeln</span><span class="p">(</span><span class="s">"tabLabel: "</span><span class="p">,</span> <span class="n">tabLabel</span><span class="p">.</span><span class="n">getText</span><span class="p">());</span>
		<span class="n">writeln</span><span class="p">(</span><span class="s">"tabTextView contents: "</span><span class="p">,</span> <span class="n">tabTextView</span><span class="p">.</span><span class="n">getBuffer</span><span class="p">().</span><span class="n">getText</span><span class="p">());</span> 
		
	<span class="p">}</span> <span class="c1">// onClicked()</span>
	
<span class="p">}</span> <span class="c1">// class PageInfoButton</span>
</code></pre></div></div>

<p>And in the <code class="language-plaintext highlighter-rouge">onClicked()</code> callback, you can see the steps outlined in the previous section. For completeness sake, we also:</p>

<ul>
  <li>grab a pointer to the tab’s label, and because we know it to be a <code class="language-plaintext highlighter-rouge">Label</code> <code class="language-plaintext highlighter-rouge">Widget</code> (that’s with an uppercase ‘L’) we cast it as such, and</li>
  <li>from there, we can use <code class="language-plaintext highlighter-rouge">Label.getText()</code> to retrieve the text visible in the tab.</li>
</ul>

<p>So, now we know how to set/get text from a <code class="language-plaintext highlighter-rouge">TextView</code> embedded in a <code class="language-plaintext highlighter-rouge">Notebook</code> page as well as how to get text from a <code class="language-plaintext highlighter-rouge">Notebook</code> tab. And we also know how to initialize the tab text when we’re creating the <code class="language-plaintext highlighter-rouge">Label</code>, but…</p>

<p>What if we wanna reset the tab text programmatically?</p>

<h3 id="the-settabtextbutton">The SetTabTextButton</h3>

<!-- 2, 3 -->
<!-- second occurrence of application and terminal screen shots on a single page -->
<div class="screenshot-frame">
	<div class="frame-header">
		Results of this example:
	</div>
	<div class="frame-screenshot">
		<figure>
			<img id="img2" src="../images/screenshots/014_container/container_20.png" alt="Current example output" />		<!-- img# -->
			
			<!-- Modal for screenshot -->
			<div id="modal2" class="modal">																<!-- modal# -->
				<span class="close2">&times;</span>														<!-- close# -->
				<img class="modal-content" id="img22" />														<!-- img## -->
				<div id="caption"></div>
			</div>
			
			<script>
			// Get the modal
			var modal = document.getElementById("modal2");													// modal#
			
			// Get the image and insert it inside the modal - use its "alt" text as a caption
			var img = document.getElementById("img2");														// img#
			var modalImg = document.getElementById("img22");												// img##
			var captionText = document.getElementById("caption");

			img.onclick = function()
			{
			  modal.style.display = "block";
			  modalImg.src = this.src;
			  captionText.innerHTML = this.alt;
			}
			
			// Get the <span> element that closes the modal
			var span = document.getElementsByClassName("close2")[0];										// close#
			
			// When the user clicks on <span> (x), close the modal
			span.onclick = function()
			{ 
				modal.style.display = "none";
			}
			</script>
			<figcaption>
			Current example output
			</figcaption>
		</figure>
	</div>

	<div class="frame-terminal">
		<figure class="right">
			<img id="img3" src="../images/screenshots/014_container/container_20_term.png" alt="Current example terminal output" /> 		<!-- img#, filename -->

			<!-- Modal for terminal shot -->
			<div id="modal3" class="modal">																			<!-- modal# -->
				<span class="close3">&times;</span>																	<!-- close# -->
				<img class="modal-content" id="img33" />																	<!-- img## -->
				<div id="caption"></div>
			</div>
			
			<script>
			// Get the modal
			var modal = document.getElementById("modal3");																// modal#
			
			// Get the image and insert it inside the modal - use its "alt" text as a caption
			var img = document.getElementById("img3");																	// img#
			var modalImg = document.getElementById("img33");															// img##
			var captionText = document.getElementById("caption");

			img.onclick = function()
			{
			  modal.style.display = "block";
			  modalImg.src = this.src;
			  captionText.innerHTML = this.alt;
			}
			
			// Get the <span> element that closes the modal
			var span = document.getElementsByClassName("close3")[0];													// close#
			
			// When the user clicks on <span> (x), close the modal
			span.onclick = function()
			{ 
				modal.style.display = "none";
			}
			</script>

			<figcaption>
				Current example terminal output (click for enlarged view)
			</figcaption>
		</figure>
	</div>

	<div class="frame-footer">																							<!--------- filename (below) ------------>
		The code file for this example is available <a href="https://github.com/rontarrant/gtkd_demos/blob/master/014_container/container_20_notebook_set_tab_text.d" target="_blank">here</a>.
	</div>
</div>
<!-- end of snippet for second (2nd) occurrence of application and terminal screen shots on a single page -->

<p>This we’ll do from another callback. Setting up the <code class="language-plaintext highlighter-rouge">Button</code> is exactly the same, so I won’t go over it here, but let’s look at the <code class="language-plaintext highlighter-rouge">SetTabTextButton</code>’s callback:</p>

<div class="language-d highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kt">void</span> <span class="n">onClicked</span><span class="p">(</span><span class="n">Button</span> <span class="n">button</span><span class="p">)</span>
<span class="p">{</span>
	<span class="n">TextIter</span> <span class="n">startIter</span><span class="p">,</span> <span class="n">endIter</span><span class="p">;</span>
	<span class="kt">int</span> <span class="n">currentPage</span><span class="p">;</span>
	<span class="n">TabTextView</span> <span class="n">tabTextView</span><span class="p">;</span>
	<span class="n">TextBuffer</span> <span class="n">textBuffer</span><span class="p">;</span>
	<span class="n">Label</span> <span class="n">tabLabel</span><span class="p">;</span>
	<span class="nb">string</span> <span class="n">newLabelText</span><span class="p">;</span>
		
	<span class="n">currentPage</span> <span class="p">=</span> <span class="n">_myNotebook</span><span class="p">.</span><span class="n">getCurrentPage</span><span class="p">();</span>
	<span class="n">tabTextView</span> <span class="p">=</span> <span class="k">cast</span><span class="p">(</span><span class="n">TabTextView</span><span class="p">)</span><span class="n">_myNotebook</span><span class="p">.</span><span class="n">getNthPage</span><span class="p">(</span><span class="n">currentPage</span><span class="p">);</span>
	<span class="n">textBuffer</span> <span class="p">=</span> <span class="n">tabTextView</span><span class="p">.</span><span class="n">getBuffer</span><span class="p">();</span>
	<span class="n">tabLabel</span> <span class="p">=</span> <span class="k">cast</span><span class="p">(</span><span class="n">Label</span><span class="p">)</span><span class="n">_myNotebook</span><span class="p">.</span><span class="n">getTabLabel</span><span class="p">(</span><span class="n">tabTextView</span><span class="p">);</span>
		
	<span class="k">if</span><span class="p">(</span><span class="n">textBuffer</span><span class="p">.</span><span class="n">getSelectionBounds</span><span class="p">(</span><span class="n">startIter</span><span class="p">,</span> <span class="n">endIter</span><span class="p">))</span>
	<span class="p">{</span>
		<span class="n">newLabelText</span> <span class="p">=</span> <span class="n">textBuffer</span><span class="p">.</span><span class="n">getText</span><span class="p">(</span><span class="n">startIter</span><span class="p">,</span> <span class="n">endIter</span><span class="p">,</span> <span class="kc">false</span><span class="p">);</span> <span class="c1">// false: do NOT include hidden characters</span>
		<span class="n">tabLabel</span><span class="p">.</span><span class="n">setText</span><span class="p">(</span><span class="n">newLabelText</span><span class="p">);</span>
	<span class="p">}</span>
		
	<span class="n">writeln</span><span class="p">(</span><span class="s">"currentPage position in the Notebook tabs array:"</span><span class="p">,</span> <span class="n">currentPage</span><span class="p">);</span>
	<span class="n">writeln</span><span class="p">(</span><span class="s">"tabLabel: "</span><span class="p">,</span> <span class="n">tabLabel</span><span class="p">.</span><span class="n">getText</span><span class="p">());</span>
	<span class="n">writeln</span><span class="p">(</span><span class="s">"tabTextView contents: "</span><span class="p">,</span> <span class="n">tabTextView</span><span class="p">.</span><span class="n">getBuffer</span><span class="p">().</span><span class="n">getText</span><span class="p">());</span> 
		
<span class="p">}</span> <span class="c1">// onClicked()</span>
</code></pre></div></div>

<p>Rather than have the <code class="language-plaintext highlighter-rouge">Button</code> pop open a dialog with a text <code class="language-plaintext highlighter-rouge">Entry</code> and all the related dialog <code class="language-plaintext highlighter-rouge">Button</code>s that go along with gathering text from a user, I opted instead for a simpler approach for this demonstration.</p>

<p>Here’s how it works… The user selects a chunk of text in the <code class="language-plaintext highlighter-rouge">TextView</code>. Then a click on this button grabs the selected text and stuffs it into the tab label. Here are the steps:</p>

<ul>
  <li>get the current page/tab,</li>
  <li>get a pointer to the <code class="language-plaintext highlighter-rouge">TextView</code> and, after that, its <code class="language-plaintext highlighter-rouge">TextBuffer</code>,</li>
  <li>grab a pointer to the tab’s label (and in this case, it’s a lowercase ‘l’, so not a <code class="language-plaintext highlighter-rouge">Label</code> Widget),</li>
  <li>check to see if some text is selected in the <code class="language-plaintext highlighter-rouge">TextView</code> and, if it is…</li>
  <li>create a string from the selected text, and</li>
  <li>call <code class="language-plaintext highlighter-rouge">setText()</code>.</li>
</ul>

<p>The rest is the same as what we had in today’s first demo.</p>

<h2 id="conclusion">Conclusion</h2>

<p>So, now we’ve got a handle on <code class="language-plaintext highlighter-rouge">Notebook</code> page/tab input/output and that’s just about as far as we’ll be going for now. Next time, we’ll jump back 
into the <em>Nodes-n-noodles</em> series.</p>

<p>Until then, have fun.</p>

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